The updated classification criteria for definite antiphospholipid syndrome (APS), also known as Hughes syndrome, specifies anticardiolipin (aCL) and anti-β2-glycoprotein I (β2GPI) antibodies of IgG and/or IgM isotype in medium or high titer as one of the laboratory criteria [1]. This evidence concerns the gene ACLY and antiphospholipid syndrome.